Ch7 - Dividing

Chapter 7 Dividing

3-22-11
Spiral Review

Dividing Mentally

15/3=5150/3=5
1500/3=500
For each zero at the end of the dividend, you will write a zero(s) at the end of the quoient
1. 36,000/6=6,000
2. 1,000/5=200
3. 300/6=50
4. 81,000/9=9,000
How about if the zeros are not in the dividend
240/6=40

Estimating Quotients

8/315 estimate 8/320=40
We increased the dividend so this is an overestimate

Diving With Remainders

14/3 ○ ○ ○
○ ○ ○
○ ○ ○ ○
○ ○ ○ ○
_4_R2
4x3=12+2=14 3 l 14
-12

2

The remainder must be less than the divisor. The part that is left over when you divide something into equal parts, it is called the remainder.

Two Digit Quotients(Long Division)
1. estimate
2. divide
3. multiply
4. subtract
5. compare
6. bring down
7. repeat
8. check

15R1
3 I 46
- 3 ↓
16
-15
1

Dividing 3 Digit Numbers

124R1

7 I 869

- 7↓ l
16 l
-14 ↓
29
-28
1

Check
124
x7
868
+ 1
869

Intrepting Remainders

14R2
4I58
-4↓
18
-16
2
Check
14
x4
56
+2
58

Zeros in Quotient

108R3
4 I 435
- 4 ↓
 03
-00
35
-32
3

Dividing Money Amounts

8 pack H20 $2.48

1. estimate

$. 31

8 I $2.48

2. Divide as if there is no decimal of the $ sign
3. Multiply
4. Subtract
5. Compare
6. Bring Down

IN NOTEBOOK
Fractions, Lengh, and the Number Line

<_I_IIII_I >
0 1 2 3 4 5

Fractions in Simplest Form (in lowest terms)
A fraction is in simplest form when, or if the numerator and the denomenator have no common factors.
same #s when you multiply
ex. 8/12 greatest common factor
8- 1, 2, 4, 8
12-1, 2, 3, 4 * 4 is the greatest common factor. *